I would have purchased the Cadillac CTS V Coupe but it was too triangular and lacked any semblance of utility. The Sedan just does not have the lines--too boring.
+1 on the Factory isolation of the F10. I love my car now but I changed wheels (HRE 20s), springs (ACS) and tuning (Dinan S2). I would have definitely preferred OEM all the way. With the weight and size of the M5, it is just an unlikely "sportscar." I have a Viper for that. It will be interesting to see what BMW takes away from the feedback it receives.